Boom construction for paving machines



Oct. '13, 19 31. P, E m 1,827,527

BOOM CONSTRUCTION FOR PAVING MACHINES Filed April 1, 1929 5 Sheets-Sheet 1 INVENTOR EH. Koehrin q.

ATTORNEY5 Oct. 13, 1931. P. A. KOEHRING 1,327,527

BOOM CONSTRUCTION FOR PAVING MACHINES Filed April 1, 1929 s sneets sneet 2 INVENTOR F BY ATTORN 5Y5 Oct. 13, 1931. P. A. )KOEHRING 1,827,527

BOOM CONSTRUCTION FOR PAVING MACHINES Filed April 1. 1929 3 Sheets-Sheet 3 new ,D o 2 INVENTOR PfiKoeh'riggv.

F 3 m @M% ATTORNEY5 Patented Oct. 13, 1931 untrue STATES PATENT OFFICE PHlLIP- Al KOEHRI' NG, 0F IDILWAUKEE, WISCONSIN, ASSIGNOR TO KOEHRING COM- BANE, (BF-"MILWAUKEE; WISCONSIN, A CORPORATION IBOOM CONSTRUCTION, FOR PAVING MACHINES Application filedApril 1,4929. Serial No. 351,774.

Concrete mixers of the type now widely known as pavers, include distributing apparatus in the form of 'a boom and; bucket mechanism. In the use of such distributing apparatus the bucket traverses the boom through the medium ofa' trolley which travels along the boom and from which the. bucket is suspended; The trolley comprises rollers which move along fianges constituting a part of'the; boom construction. In the construction of a conventlonalpavmg machine the boom distributor is supportedv on the mam mixing machine for movementverticallyand maintains a vertical pendant position, and

causes the rollers constitutinga part. of the trolley to jam on one side, which effect has proved to be an operating disadvantage in many instances, not to mention the'setting up of undue stresses in the hanger-member supporting the bucket on'the trolley.

The instant invention broadly contem- 4 plates theprovisionot a'novel" type'of'boom together with its mounting, which boom functions to maintain the bucket it supports in a condition of true suspension regardless ofthe position of the-body of the 'paver with respectto the horizontal; This end'is attained by mounting the boom" on. the body with a pivotal mountin'gcomprisingpivots in the three dimensions, this in lieu of? the prac tice heretofore availed of-apivotally' mounting the boom in only two dimensions as rock or-tilton an axis-which is in'alignment with the longitudinal dimension of-the boom;

Incarrying-"out myidea more in'detail the inner end of the boom is provided with brackets for carryinga pin that adapts the boom for swinging in'a vertical plane. This pin in turn is mounted onanothenpinhaving: suitable bearing in apivoted plate, and this pin renders to the boom the capability of oscillating on an axis extending length wisewith respecttothe boom. The pivoted plate-is 'piyotally mounted on the body of the machine and permits movement/of the boom in a horizontal plane. Suitable instrumentalities are provided for controlling the turn.- ing; actions of the boom in the vertical and horizontal planes while the bucket is permitted to controlthe swivelling action of the boom on its longitudinal axis.

It might be well to note at-sthis point that a freely turning boom such as providedby this invention hasthe advantage of obviating any damage which might occur if the. bucket were to strike against an obstacleduringswinging of the boom in a horizontal plane,- this advantage being attained due to, the ability of the boom to turn on a longitudinal axis.

Particular objects-and advantages of the: invention arise in association with theiprovision of the mountings aforesaid,.together with the means for controlling the; turning movements of the-boom; These will inpart become apparent and in part be hereinafter stated as the description of the invention. proceeds. For a full and more complete'understanding'tliereof', reference may be. had. to the-following description and accompanying.

drawings, wherein- Figure I is a plan view of the inner end' of the boom, bringing out the means employed for mounting the boomon the body of 'a paving machine.

Figure 2i's a;view from the sideofltheapparatus shown in Figure 1, taken about on the line'22 of Figure 1, parts beingshown in. sectionand parts in elevation.

Figure- 3- is an end view, somewhatx dia grammatic, of'a pavingmachine, bringing: out the vertical disposition of: the boomwh'em the-machine-is disposed out of the'horizontal;v

Figure 4: isa detail view'in. perspective; showingthebracket arrangement. which is; affixed to the boom proper.

Figure 5 is an end'view ofthe bracketaars rangement shown in Figure. 4;

\Vhile a preferred, specific embodiment of i herein'set forth, it is to be understood that I am not to belimited to the exact constructions illustrated and de-' the invention is scribed, because various modifications-of these details may be provided in putting the inven- 32:; Throughout the, drawings and tion into practice within the purview of the appended claims.

description, like reference characters denote correspondingparts Apaving machine is shown in F1gures3 andYQ and referred to generally by the refer- EQHCG character A; This machine is mounted 421300111 is a bucket D which receives concrete to cause a; turning of the boom in a horizon the segmental plate? and the bracket l.

on traction devices B which travel over-the ground or the surface onwhich the machine operates. A boom C extends from the machine A, andf intended for travel along. this from the mixing apparatus in the machine A and distributesthe to be paved.

The boom which in turn are provided with the flanges 3-on which the trolley carrying the bucketv operates. I a p A bracket a is afiixedto the body of the paver A in any ings shown at 5. Thebracket 1 is provided with a portion26'which has an opening there- '-i through and constitutes the bearlng for a segmental plate 7 which hasa pivot member 8eXtending through the opening in the portion 6. A nut and bolt arrangement shown at 9 serves to maintain engagement between The segmental plate 7 isprovided with worm gear teeth as shown at-lO which cooperateiwitha worm 11' that is operated by any suitable instrumentalities such as shown at 12 tal' plane. The member 7 is formed with a portion 13 havinga horizontal bore 14, This portion 13 with its bore 1% constitutes a bearing for the pin member:15 which may beheld inproper position in the bore 14 by a counterpin as shown at 16. The pm 15 1s of the construction clearly, shown in Figuresfi and 8 and includes a transverse opening 17 which constitutes a bearing for a pin 18. The pin T 18 constitutes a pivotal axis for the bracket device shown at 19 that is afiixed to the chanfollowing same on the sub-grade C is of a channel bar construc- "-:;tion as clearly shown 11'1 Figures 1 and 4:, and comprises channel bar members 1 and 2 preferred manner such as by riveting the same thereto through the opennel members 1 and 2 comprising the'boom C. The bracket device 19 may be fastened to the boom members 1 and 2 in any preferred manner such as by rivets shown at 20.

The construction of the bracket device 19 is such that it accommodates" the journal portion 13 of the segmental member 7 this for mation of the bracket device 19 being clear 1y shown in Figure 5. QThe pin '15 is pro vided' withthe lubricating. means shown at 21 for lubricating the bearing of the pin 18 in the opening 17.

From the foregoing, it is apparent that the parts 6 and 8 provide fora swinging of the boom in a horizontalplane while the pin 18 provides fortheswi'ngingin a' vertical plane. The pin 15 together with its journal 13 affords the tilting of the boom about an axis co-extensin' e with the longitudinal 'di-' mension of the road in which the paver rests in accordance with the objects of this invention. This tilting action of the boom is limited only by the relation'betweenthe extremij ties of the pin 18 and segmental member 7.

Reference is made particularly to Figure 3, in which the paving machine A is shown inclined side-wisebut the boom has by automatic or self-ad ustment assumed or, maintained a true vert cal'position along Wlth the suspended bucket D; p The view is exaggerated but depicts the position of the boom distributor in havingaproper free action though the machine carrying it is laterally inclined. I

Having thus described my invention, what I claim as new and desire to secureby Letters Patent of the United States, is 1. A boom construction of the class described, c'omprising, in combination, a boom, a bracket device afiixed to the boom, a pivotal mounting forthe bracket device, a pivotal mounting for the first named pivotal mounting, and a third rotatable mounting carrying the first two pivotal mountings, and a disdispo'sed to operate on the 19;

tributing bucket boom. V

2. A boom construction of the class described, comprising, in combination, a boom,

' a bracket device afiixed to the boom, a'pivotal mounting 1 for the bracket device, a pivotal mounting for the first named pivotal mounting, .a third rotatable mounting carrying the first two pivotal mountings, and 'means for controlling turning operations'of the boom on its various axes. p A

3. A boom construction of the class described, comprising, in combination, a boom,

a bracket device afixed to the'boom, a pivotal mounting for the bracket device, a pivotal mounting for the first named pivotal mounting, a third rotatable 'mountingcarrying the first two pivotal mountings, andmeans for controlling turning operations of the boom on its various axes, said meansfincluding manually operable devices ,for controlling turning operations in the vertical and horizontal planes and a bucket for controlling the swivelling actions of the boom on a longitudinal axis.

4. In a paving machine of the class described, a boom, inflexible drive means for swinging said boom in a plane substantially parallel to the road on which the machine rests, and a universal joint providing for movement of the boom about angularly related axes.

5. In a paving machine of the class de scribed, a boom mounted on an axis extending longitudinally of the machine, and inflexible drive means for swinging said boom in a plane substantially parallel to the road on which the machine rests.

6. In a paving machine of the class described, a boom, a machine frame, a member mounted on said frame for pivotal movement in one plane only, said frame having means for imparting movement to said member, and a connection between said member and said boom, said connection providing for movement of said boom about an axis extending longitudinally of the frame.

7. In a paving machine of the class described, a boom, a machine frame, means providing a universal joint between the boom and the frame, said means including a member mounted on the frame for pivotal movement in a plane parallel to the road over which the machine moves, and a pivotal connection between the boom and said member providing for movement of said boom about an axis extending longitudinally of the frame.

8. In a paving machine of the class described, a boom, a frame having a bracket provided with a pivot opening substantially normal to the road over which the machine moves, a member having a pin disposed in said opening, means for causing pivotal movement of said member in said opening,

: and a bracket on the boom and connected with said member for pivotal movement relative thereto about an axis longitudinally of the frame.

9. In a paving machine of the class described, a boom, a frame, a toothed member pivoted to the frame for movement in a plane parallel to the road on which the machine rests, threaded means mounted on the frame, and coacting with the toothed member to move the latter, and a pivotal connection between the boom and member providing for movement of the boom about an axis longitudinally of the frame.

10. In a paving machine of the class described, a boom, a frame, a toothed member pivoted to the frame for movement in a plane parallel to the road on which the machine rests, threaded means mounted on the frame and coacting with the toothed member to move the latter, and a pivotal connection between the boom and member providing for movement of the boom about an axis longitudinally of the frame, said member having a pivot opening and said boom having a pin pivotally mounted in said opening.

11. In a paving machine of the class described, av boom, a frame, a gear sector pivoted to the frame for movement in a plane parallel to the road on which the machine rests, threaded means mounted on the frame and coacting with the gear sector to move the latter, and a pivotal connection between the boom and sector providing for movement of the boom about an axis longitudinally of the frame.

12. In a paving machine of the class described, a boom having a bracket provided with a pin mounted on the bracket for pivotal movement relative thereto in a plane normal to the road on which the machine rests, a machine frame, a bracket on the frame, and instrumentalities mounted on said bracket for moving the boom in a plane parallel to the road, said instrumentalities including a pivot opening extending longitudinally of the frame, said pin being mounted in said opening, whereby said boom is movable in a plurality of angular-1y related planes.

13. In a paving machine of the class described, a boom having a bracket provided with a pin mounted on the bracket for piv otal movement relative thereto in a plane normal to the road on which the machine rests, a machine frame, a bracket on the frame, and instrumentalities mounted on said bracket for moving the boom in a plane parallel to the road, said instrumentalities including a pivot opening extending longitudinally of the frame, said pin being mounted in said opening, whereby said boom is movable in a plurality of angularly related planes, said instrumentalities including further gear and worm members.

In testimony whereof I affix my signature.

PHILIP A. KOEHRING. 

